Analog Devices Inc. AD7475BRM-REEL7

Overview

AD7475BRM-REEL7 from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC operating from a single 2.7 V to 5.25 V supply, featuring an external 2.5 V reference input (REF IN), no pipeline delay, and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It delivers 68 dB SINAD at 300 kHz input frequency and consumes only 4.5 mW at 3 V/1 MSPS - ideal for portable medical instruments and battery-powered data acquisition systems.

For engineers reviewing the AD7475BRM-REEL7 datasheet, AD7475BRM-REEL7 pinout, AD7475BRM-REEL7 application, or AD7475BRM-REEL7 equivalent, key selection considerations include its 8-lead MSOP package, VDRIVE logic-level independence, 1 µA full power-down current, 12-bit DC accuracy (±1 LSB INL max), and absence of pipeline latency in high-speed sampling control.

Technical Context

The AD7475BRM-REEL7 implements a capacitive DAC-based successive-approximation architecture with on-chip track-and-hold, enabling precise sampling on the falling edge of CS and conversion initiation without pipeline delay. Its analog input range is strictly 0 V to REF IN (2.5 V ±1%), and conversion timing is fully determined by SCLK frequency - 16 cycles required at up to 20 MHz.

It supports three power modes: normal (1.5 mA at 3 V/1 MSPS), partial power-down (450 µA), and full power-down (1 µA). The VDRIVE pin decouples logic interface voltage (2.7 V–5.25 V) from VDD, allowing direct interfacing with 3 V or 5 V microprocessors without level shifters.

Key Specifications

Pinout & Package

AD7475BRM-REEL7 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant and tape-and-reel packaged per REEL7 ordering suffix.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, 1 MSPS SAR ADC applications.

Compared with AD7475BRM-REEL7, AD7476BRM-REEL7 trades SNR for speed and ADS7822U sacrifices throughput and interface flexibility for lower quiescent power - making AD7475BRM-REEL7 the optimal balance for 1 MSPS, mixed-voltage, precision portable systems.

Availability

AD7475BRM-REEL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data acquisition, optical sensor interface, and industrial control loop feedback requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AD7475BRM-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing expertise spanning precision data conversion, amplification, and power management.

The AD7475BRM-REEL7 belongs to Analog Devices' micropower SAR ADC product line, engineered specifically for space-constrained, battery-operated systems demanding high throughput, low power, and deterministic timing without pipeline artifacts.

FAQ

What is the reference configuration for AD7475BRM-REEL7?

The AD7475BRM-REEL7 requires an external 2.5 V reference applied to the REF IN pin, with ±1% tolerance for specified performance. A minimum 0.1 µF ceramic capacitor must be placed directly between REF IN and GND. Unlike the AD7495, it does not include an internal reference - using an inaccurate or poorly bypassed external reference degrades INL, gain error, and SNR.

Does AD7475BRM-REEL7 support true 1 MSPS continuous sampling?

Yes, AD7475BRM-REEL7 achieves 1 MSPS continuous throughput when operated with a 20 MHz SCLK and proper timing margins: conversion time is fixed at 800 ns (16 SCLK cycles), and minimum quiet time between conversions is 100 ns. This yields a total cycle time of 1 µs, matching the 1 MSPS rate - confirmed in Timing Example 1 of the datasheet.

Can AD7475BRM-REEL7 interface directly with a 3 V microcontroller while powered from 5 V?

Yes - the VDRIVE pin enables independent logic-level setting. When VDRIVE = 3 V and VDD = 5 V, all digital inputs (CS, SCLK) accept 3 V logic thresholds, and SDATA outputs are compatible with 3 V receivers. This eliminates level shifters and simplifies interconnect in mixed-supply systems, as verified in the General Description and Pin Function Descriptions sections.

What is the significance of "no pipeline delay" in AD7475BRM-REEL7?

"No pipeline delay" means AD7475BRM-REEL7 is a classic successive-approximation ADC: sampling occurs on the CS falling edge, and the full 12-bit result is available after exactly 16 SCLK cycles - with no additional latency or output register staging. This enables precise, deterministic timing for time-critical applications like motor current sampling synchronized to PWM edges.

How does power consumption scale with throughput in AD7475BRM-REEL7?

AD7475BRM-REEL7 power scales linearly with throughput in normal mode (e.g., 1.5 mA at 1 MSPS, ~150 µA at 100 kSPS), but offers two dedicated low-power modes: partial power-down (450 µA typical at 100 kSPS) and full power-down (1 µA max). These modes reduce current draw during idle periods without affecting wake-up latency or conversion accuracy upon reactivation.